20010220 has 48 divisors (see below), whose sum is σ = 43354080. Its totient is φ = 7755264.

The previous prime is 20010217. The next prime is 20010223. The reversal of 20010220 is 2201002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20010217) and next prime (20010223).

It is not an unprimeable number, because it can be changed into a prime (20010223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145992 + ... + 146128.

It is an arithmetic number, because the mean of its divisors is an integer number (903210).

Almost surely, 2^20010220 is an apocalyptic number.

20010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010220 is an abundant number, since it is smaller than the sum of its proper divisors (23343860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20010220 is a wasteful number, since it uses less digits than its factorization.

20010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 20010220 is about 4473.2784398023. The cubic root of 20010220 is about 271.4879893663.

Adding to 20010220 its reverse (2201002), we get a palindrome (22211222).

The spelling of 20010220 in words is "twenty million, ten thousand, two hundred twenty".